Determination of trace amounts of Pd(II) and Rh(III) ions in Pt–Ir alloy and road dust samples by flame atomic absorption spectrometry after simultaneous separation and preconcentration on non-modified magnetic nanoparticles
Determination of trace amounts of Pd(II) and Rh(III) ions in Pt–Ir alloy and road dust samples by flame atomic absorption spectrometry after simultaneous separation and preconcentration on non-modified magnetic nanoparticles
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DOI：
10.1016/j.scient.2011.11.030
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发表时间：
2011-12
期刊：
影响因子：
1.4
通讯作者：
S. Mohammadi;M. Karimi;H. Hamidian;Y. Baghelani;L. Karimzadeh
中科院分区：
文献类型：
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作者：
S. Mohammadi;M. Karimi;H. Hamidian;Y. Baghelani;L. Karimzadeh
本工作研究了磁性纳米Fe3O4作为吸附剂的潜力，在火焰原子吸收光谱分析之前，同时分离和预富集了铂-Ir合金和粉尘样品中的痕量钯和铑。研究了pH在3~12范围内对分析物离子吸附的影响。在pH值为10-12的范围内，磁性纳米Fe3O4对被分析离子进行定量吸附，然后在外加磁场的作用下，磁性纳米颗粒(MNPs)可以很容易地从水溶液中分离出来。因此，不需要过滤或离心法。在最佳实验条件下，钯的线性范围为0.0 1~5.5μg/m L−1，铑的线性范围为0.005~3.0μg/m L−1。基于3Sb，钯和铑的检出限分别为2.9和1.4 ng/m L−1。Pd(II)和Rh(III)离子0.5gμg和L−1的8次重复测量的相对标准偏差分别为1.9%和1.7%。最后，将该方法成功地应用于铂Ir合金和道路粉尘样品中钯和铑的萃取和测定。
This work investigates the potential of magnetic Fe3O4nanoparticles as an adsorbent for simultaneous separation and preconcentration of trace amounts of palladium and rhodium from Pt–Ir alloy and dust samples, prior to flame atomic absorption spectroscopy determinations. The effect of pH on the adsorption of analyte ions over a pH range from 3 to 12 was studied. The analyte ions quantitatively were adsorbed on magnetic Fe3O4nanoparticles in the pH range of 10–12 and, then, magnetic nanoparticles (MNPs) were easily separated from the aqueous solution by applying an external magnetic field. Thus, no filtration or centrifugation was necessary. After extraction and collection of MNPs, the analyte ions were eluted using HCl 1.0 mol L−1. Under the best experimental conditions, linearity was maintained between 0.01–5.5 μg mL−1for palladium, and 0.005–3.0 μg mL−1for rhodium. Detection limits for palladium and rhodium were 2.9 and 1.4 ng mL−1based on 3Sb. The relative standard deviation of eight replicate measurements of 0.5 μg L−1of Pd(II) and Rh(III) ions was 1.9% and 1.7%, respectively. Finally, the method was successfully applied to the extraction and determination of palladium and rhodium ions in Pt–Ir alloy and road dust samples.